Improvement in millstone-staffing machines



W. N. COSG-ROVE.

MILESTONE STAFFING MACHINE.

110.181.77 1. Patented Sep t.5,1876a ATTORNEY UNITED STATE PATENTOFFICE.

WILLIAM N. GOSGROVE, or FARIBAULT, MINNESOTA, AssIeNon OF oNE- FOURTH orHIS RIGHT TO JNo. s. JORDAN, or sAME PLACE.

IMPROVEMENT IN MlLLSTONE-STAFFING MACHINES.

Specification forming part of Letters Patent No. 181,774, datedSeptember 5, 1876; application filed June 17, 1876.

To all whom it may concern:

Be it known that I, WILLIAM N. COSGROVE, of Faribault, in the county ofRice and State of Minnesota, have invented a new and valuableImprovement in Millstone Staffing Machines; and I do hereby declare thatthe following is a full, clear, and exact description of theconstruction and operation of the same, reference being had to theannexed drawings, making a part of this specification, and to theletters and figures of reference marked thereon.

Figure 1 of the drawings is a representation of a plan view of myinvention. Fig. 2 is a vertical central section thereof. Fig. 3 is adetail view.

The object of this invention is to provide an improved machine forstaffing millstones, which shall be readily adjustable and equallyapplicable to runners and bedstones. The invention consists in theconstruction and novel arrangement of a metallic ring having a perfectface, and guides adjustable to the stone, and a diametric staff withcenter opening, end adjustments in connection with said ring, and woodenface grooved for filling of coloring matter, as hereinafter shown anddescribed.

In the accompanying drawings, the letter A designates the stone. Brepresents the ring, whose diameter is a little less than that of thestone, and Whose lower or bearing edge a is ground perfectly true. Atseveral points guides b are attached to the ring, and turned down toextend over the edge of the stone, and hold the ring in position whilebeing revolved thereon. The ring is designed to have sufficient depthand weight to prevent it from springing. The guides 12 are made with arectangular bend at c, to extend over the edge of the stone, and arethreaded for adjustment in the ring. At one point an opening or notch,01, is cut or formed in the lower edge of the ring, to receive one endof the staff, and on one side of this opening a projecting lug, e, isformed, and provided with a threaded aperture for the reception of aset-screw, f, which serves to secure the staff when adjusted to the faceof the ring. (3 represents the staff, which is arranged to extenddiametrically across the ring. The body of the staff is usually made ofmetal, and of sufiicient length to extend across the stone, or nearlyso. A central opening, g, is provided to clear the spindle andbed-stone. In order to give it strength, vertical ribs k may be formedon its branches, extending from the circular flange k of the centralopening toward or to the ends. D represents a wooden block or facing,

which is attached to one branch of the staff, by

screws or otherwise. On its under side this block is provided withlongitudinal grooves l, which are designed to carry the paint orcoloring matter m, and for that purpose .may be slightly dovetailed incross-section. From the upper side of this branch of the staff an arm,E, extends upward over the ring, and is provided with a set-screw, n,which bears on the upper edge of the ring, and serves to adjust thestaff thereto. On the opposite branch of the staff an arm or bend, F, isarranged to extend over the edge of the stone, and is provided with aset-screw, n, to adjust this end of the stafi' to the ring. When thestaff is adjusted on the stone, it is secured to the ring by twothumb-screws--one of which, f, has been mentioned as being connectedwith the ring. The other, f, extends through the arm or bend l of thebranch, and bears against the ring. At the end of the branch oppositethat which carries the block or red-staff is arranged a set-screw, 2,which is designed to serve in adjusting the face of the red-stalf to theproof-staff, which is kept in every mill to test the common wood staff.In case it is necessary to staff the center of the stone lower than thegrinding-surface, this screw is used to adjust the staff accordingly. Italso serves to adjust the staff on the stone until the adjustment to thering above referred to is effected.

When the staffing device is properly adjusted and revolved on the stone,the coloring matter of the grooves marks the places which require to bedressed. This is repeated until the staff colors the entire face of thestone.

When both runner and bed-stone are reduced to perfect faces, the runneris placed on its spindle.

In some particulars the details of construction may be varied by thoseskilled in the art. Hence it is not desired to confine the constructionto the precise limits herein described and shown.

I am aware that it is not new to form a tram stall with a metallic back,and a face of Wood or other porous material capable of holding acoloring matter by absorption; hence I do not claim such device,broadly.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with the ring B, of the radial right-angular guides11, substantially as specified.

2. In combination with the ring B, the diametrical stafl' 0, adapted tobe clamped and adjusted on the said ring, substantially as specified. v

3. In combination with the ring B, having edge opening d, thediametrical staff (3, having arms E F, and set-screws n n and f f,substantially as specified.

4. In combination with the ring B and diametrical staff 0, having woodfacing D, the leveling-screw z, substantially as specified.

5. The edge'ring B, having projecting lug 6, with set-screw f, and theedge opening d, in combination with the diametrieal stafl' G, projectingthrough the said opening, substantially as specified.

'6. The staffing device for millstones, consisting of a metallic ringprovided with guides to hold it in position on the stone, concentricwith its periphery, a diametrical metallic staff, faced with wood,carrying a coloring material in grooves upon its under side, and set andthumb screws for adjusting the stafi' to the ring and face of the stone,substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the 'presence of two witnesses.

WILLIAM N. OOSGROVE.

Witnesses:

O. F. PERKINS, O. B. CASE.

